Color-Tunable Low-Threshold Amplified Spontaneous Emission from Yellow to Near-Infrared (NIR) Based on Donor-Spacer-Acceptor-Spacer-Donor Linear Dyes
- 주제(기타) Materials Science, Multidisciplinary
- 설명문(일반) [Tang, Xun; Lee, Yi-Ting; Feng, Zhao; Ribierre, Jean-Charles; Adachi, Chihaya] Kyushu Univ, Ctr Organ Photon & Elect Res OPERA, Fukuoka 8190395, Japan; [Ko, Soo Young] Ewha Womans Univ, Dept Chem, Seoul 03760, South Korea; [Wu, Jeong Weon] Ewha Womans Univ, Dept Phys, Seoul 03760, South Korea; [Placide, Virginie] Ewha Womans Univ, Dept Phys, Seoul 03760, South Korea; [D'Aleo, Anthony] Yonsei Univ, CNRS Sorbonne Univ Yonsei Univ, UMI 2002, Bldg Blocks Future Elect Lab, Seoul 03722, South Korea; [Adachi, Chihaya] Kyushu Univ, Int Inst Carbon Neutral Energy Res WPI I2CNER, Fukuoka 8190395, Japan
- 등재 SCOPUS
- OA유형 Green Submitted
- 발행기관 AMER CHEMICAL SOC
- 발행년도 2020
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000175395
- 본문언어 영어
- Published As http://dx.doi.org/10.1021/acsmaterialslett.0c00421
초록/요약
Organic lasing dyes possessing small energy gaps commonly suffer from high thresholds, because of energy-gap law, which induces detrimental nonradiative relaxation. Herein, molecules based on alternating donor (D) and acceptor (A) moieties are described. Those linear molecules are built with a spacer between D and A, with a general formula of D-spacer-A-spacer-D. Such modification of the A core allows one to obtain color-tunable lasing properties from yellow to near-infrared (NIR). Into more details, triphenylamine (TPA) is selected as the D moiety, while benzothiadiazole (BTD) and benzo[1,2-c:4,5c']bis[1,2,5]thiadiazole (BBTD) with strong electron-withdrawing capability, are chosen as A cores for yellow ((TPA-F)(2)BTD) and NIR ((TPA-F)(2)BBTD) lasing dyes, respectively. Both dyes exhibit high photoluminescence quantum yields (PLQYs) and fast fluorescence radiative rate. The corresponding amplified spontaneous emission (ASE) thresholds of yellow and NIR dyes are as low as 0.5 and 3.8 mu J cm(-2) in the solution-processing blending films, with wavelength peaks at 550 and 811 nm, respectively. In those dyes, the long alkyl chains appended on the fluorene conjugated spacer guarantee the high solubility and prevent aggregation. Consequently, for (TPA-F)(2)BTD, the neat film allows one to reach PLQYs as high as 90%, with a low ASE threshold (1.9 mu J cm(-2)) and good stability. Therefore, such promising molecular design allows the realization of color-tunable ASE or lasing dyes with very low thresholds.
more